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124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
/*
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* adb.c
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* quack
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*
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* Created by Michel DEPEIGE on 7/01/2020.
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* Copyright (c) 2020 Michel DEPEIGE.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see the file COPYING); if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*
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*/
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#include <stdio.h>
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#include "driver/gpio.h"
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#include "sdkconfig.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_system.h"
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#include "esp_spi_flash.h"
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#include "adb.h"
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#include "gpio.h"
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/* static defines */
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static void adb_tx_async(void);
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static void adb_tx_one(void);
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static void adb_tx_zero(void);
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/* functions */
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void adb_init(void) {
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/* If jumper is set, switch to ADB host mode */
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if (gpio_get_level(GPIO_ADBSRC) == 0)
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xTaskCreatePinnedToCore(&adb_task_host, "ADB_HOST", 6 * 1024, NULL, 4, NULL, 1);
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else
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xTaskCreatePinnedToCore(&adb_task_mouse, "ADB_MOUSE", 6 * 1024, NULL, 4, NULL, 1);
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/* initialise */
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}
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void adb_task_host(void *pvParameters) {
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/* wait a little bit for H to set up, otherwise devices will not see the reset command */
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gpio_set_level(GPIO_ADB, 1);
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vTaskDelay(20 / portTICK_PERIOD_MS);
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adb_tx_reset();
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adb_tx_cmd(ADB_MOUSE|ADB_TALK|ADB_REG0);
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while (1) {
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vTaskDelay(1000 / portTICK_PERIOD_MS);
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}
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}
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void adb_task_mouse(void *pvParameters) {
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}
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static inline void adb_tx_async() {
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/* send attention (800 µS low) + sync (70 µS high) */
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gpio_set_level(GPIO_ADB, 0);
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ets_delay_us(800);
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gpio_set_level(GPIO_ADB, 1);
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ets_delay_us(70);
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}
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void adb_tx_cmd(unsigned char cmd) {
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adb_tx_async();
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/* send actual byte (unrolled loop) */
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cmd & 0x80 ? adb_tx_one() : adb_tx_zero();
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cmd & 0x40 ? adb_tx_one() : adb_tx_zero();
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cmd & 0x20 ? adb_tx_one() : adb_tx_zero();
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cmd & 0x10 ? adb_tx_one() : adb_tx_zero();
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cmd & 0x08 ? adb_tx_one() : adb_tx_zero();
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cmd & 0x04 ? adb_tx_one() : adb_tx_zero();
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cmd & 0x02 ? adb_tx_one() : adb_tx_zero();
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cmd & 0x01 ? adb_tx_one() : adb_tx_zero();
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/* stop bit */
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adb_tx_zero();
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gpio_set_direction(GPIO_ADB, GPIO_MODE_INPUT);
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}
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static inline void adb_tx_one() {
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/* values from AN591 Datasheet minus the estimated call to ets_delay_us */
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gpio_set_level(GPIO_ADB, 0);
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ets_delay_us(30);
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gpio_set_level(GPIO_ADB, 1);
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ets_delay_us(60);
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}
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void adb_tx_reset() {
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/*
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* ADB spec says reset signal low for 3ms ±30%
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* Note that the ADB Desktop Bus Mouse G5431 uses 4ms when plugged
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*/
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gpio_set_level(GPIO_ADB, 0);
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ets_delay_us(3000);
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gpio_set_level(GPIO_ADB, 1);
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ets_delay_us(1000);
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}
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static inline void adb_tx_zero() {
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/* values from AN591 Datasheet minus the estimated call to ets_delay_us */
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gpio_set_level(GPIO_ADB, 0);
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ets_delay_us(60);
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gpio_set_level(GPIO_ADB, 1);
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ets_delay_us(30);
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}
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